There is a normal range of motor strength that each muscle group in the body has. Arm weakness would simply be a lesser motor strength than normal in one or muscle groups that move the arm.
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3

At least!:
Need an ultrasound and echo of heart at a minimum as well as possible evaluation of blood and clotting system by blood tests. May want to talk to vein doctor as Ct angiography may be more revealing. Do not wait on this!
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5

Have it evaluated:
This issue needs a detailed evaluation to determine the cause and treatment options. You may want to start with a neurologist but do something before the problem continues to increase.
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10

Problems here:
It's my guess that the test would be considered "medically necessary" & thus approvable only AFTER conventional neurological workup was inconclusive. Also, isolated LEMS is even rarer (much) than the already very rare lung-ca-associated LEMS. So if you DID get the test & it was positive, chances are you'd be packed off to the oncologist, not the neurologist.
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12

Pinched nerve?:
You may have a pinched nerve in the neck, possibly caused by a disc in the neck putting pressure on a nerve. You need to see a doctor and have this checked, before the weakness becomes permanent. Good luck!
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13

There ate many poss-:
-ibilies. Winging of the scapula is best tested by doing a wall pushup. If severe winging could be due to nerve injury to the brachial plexus involving the long thoracic nerve of Bell. Seen after breast removal. Because of arm weakness brachial plexus higher up as in TOS can cause this. Seek out a fellowship trained sports medicine orthopedic surgeon 4 exam& images. Hands on exam is needed.
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18

Motor function:
There is a normal range of motor strength that each muscle group in the body has. Arm weakness would simply be a lesser motor strength than normal in one or muscle groups that move the arm.
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19

Several poss. causes:
Could be illness such as ms, certain autoimmune disorders, every dystrophy, or others. Commonly, it's due to nerve impingement in the neck due to arthritis or disc disease. Other causes include rib, sternal, clavicle or thoracic spine dysfunction, rotator cuff tear, tendinitis and muscle strain, etc. A thorough physical exam, including osteopathic hand-on diagnosis, could provide an answer.
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